Door-operating mechanism.



J. P. & W. A. HELMER.

DOOR OPERATXNG MEGHANISM.

APPLIGATIQN FILED JAN. 22, 1912.

,057547. Patented Apr" 1, 19113.

ree Cars im me m'ventlfm ,cir s ences and Qombmanlns oA dam-ed 'to o ld Clnsng i commet mi? of seme time the Contact lever 1T is moved out of engagement with the Contact 20, it moves motor 14 is started to run in the proper di-` rection' to close the doors 2. At the cxtreme closing movements of the doors2, the contact levers are again' re-set in the positions ../hown 1n the drawings, by means oi the pm 15 coming in Contact with the Contact lever f 16. To permit the doors 2 to be opened and closed by the conductor or passengers from any part of the car, a, plurality of sets of push buttons 27 and 28 are located otvconvenient points Within the car and on the platform. The additional sets of push buttons 27 and 28 aie connected to the main set of push buttons 27 and 28 fby menus of branch wines 29 and 30 respectively. In oider to distinguish the push buttons 27 and 28 one from the other, the push butt-ons 27 are indicated in black and the push buttons 28 are indicated in White. As 1s evident, in place of the battery 24 any other source of electrical energy may be employed.

lil/hatA we claim is: l

The combination with :L door mounted for sliding movement, and switch operating Ineens carried thereby, of a. motor, conneo tions from said motor to said door for opening and closing the same including n rack and pinion, push buttons and electrical oonnections for starting said motor to drive the same in either direction, parallel switches, und a link'connecting said switches for simultaneous movements, said switches a1'- mnged to be alternately operated by said switch operating means at the extreme movements of'snid door for throwing the motor out of action.

ln testimony whereof We affix our signatures in presence of two witnesses.

JO'HN l. HEIMER. lVlLLli-XM A. HEMER. llfitnesses MILDRED L. Mmmm, HARRY D. KILGURE. 

